Method for the production of gratings

Abstract

The invention relates to a method for the production of gratings. To provide an improved method for the production of gratings, a solution is provided within the scope of the invention, which comprises the following steps in the following order: Hot-dip galvanizing of the bearing-bar strip or the bearing- and cross-bar strip, Punching the bearing bars or the bearing and cross bars and cutting them to length, Pressing of the grating, Banding of the grating. This sequence of steps, in conjunction with modifications within the steps, makes for improved corrosion protection and higher dimensional accuracy. It is no longer necessary to straighten the gratings.

1 . Method for the production of gratings, comprising the following steps in the following order:
 Hot-dip galvanizing of the bearing-bar strip or the bearing- and cross-bar strip,   Punching the bearing bars or the bearing and cross bars and cutting them to length,   Pressing of the grating,   Banding of the grating.   
   
   
       2 . Method according to  claim 1 , characterised in that the bearing-bar strip or the bearing- and cross-bar strip is hot-dip galvanized in a continuous process. 
   
   
       3 . Method according to  claim 1 , characterised in that the cutting punch for punching the bearing bars or the bearing and cross bars is configured as a longish, flat element ( 1 ) that features rotationally symmetric reductions ( 2 ) at its upper and lower free ends. 
   
   
       4 . Method according to  claim 4 , characterised in that, in the area adjacent to each of the areas with the smaller cross-section, the cutting punch features a depression ( 3 ) which is on the opposite side to that featuring a reduction ( 2 ). 
   
   
       5 . Method according to  claim 1 , characterised in that for banding the grating, a welding temperature is selected which is below the vaporisation temperature of zinc. 
   
   
       6 . Method according to  claim 5 , characterised in that the welding method known as “MIG soldering of galvanized steels with A 202 M” is used for banding the grating.